Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.8*120（40-x)+90*1.1x <3880 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.8 * 120 * ( 40 - x ) + 90 * 1.1 * x <3880         (1)

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    From inequality(1)：
         x < 40/3

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    The final solution set is :
         x < 40/3

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